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The Near-Infrared 3Φ → (1)3Δ Transition of LaF

✍ Scribed by A. Bernard; C. Effantin; J. d'Incan; J. Vergès

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 126 KB
Volume: 204
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.2000.8199

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✦ Synopsis

Rotational analyses of 32 subbands of the near-infrared 3 ⌽ 3 (1) 3 ⌬ system of LaF have been carried out, involving the levels v ϭ 0 -7 of the two states. The three subsystems were first treated as separate singlet systems, directly at equilibrium. Perturbations were revealed in the lower state, ascribed to spin-uncoupling interactions between (1) 3 ⌬ 3 (v) and (1) 3 ⌬ 2 (v ϩ 1) levels. A 21 ϫ 21 matrix representation at equilibrium of the complex of interacting levels (v ϭ 0 -6) was then constructed, each diagonal v-block corresponding to a triplet model of the rovibrational 3 ⌬ Hamiltonian. The observed perturbations were completely reduced in the harmonic oscillator approximation with an experimental value of the interaction parameter B 0,1 ⌬ ϭ 0.01322(2) cm Ϫ1 . The wavenumbers of some 4500 lines of the system were fitted with an rms error of about 0.005 cm Ϫ1 . (Line lists are available in electronic form via http://www-obs.univ-lyon1.fr/ϳABernard/index.html.

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